Net Loss Per Share - Summary of Potential Gross Ordinary Shares Equivalent Excluded from Computation of Net Loss per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net loss per share	17,034,848	15,370,660	17,034,848	15,370,660
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net loss per share	15,857,759	15,036,782	15,857,759	15,036,782
Unvested restricted shares and restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net loss per share	1,177,089	333,878	1,177,089	333,878